TW202243614A - 用於降低磨料顆粒與清潔刷之間的相互作用之組合物及方法 - Google Patents
用於降低磨料顆粒與清潔刷之間的相互作用之組合物及方法 Download PDFInfo
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- TW202243614A TW202243614A TW111128325A TW111128325A TW202243614A TW 202243614 A TW202243614 A TW 202243614A TW 111128325 A TW111128325 A TW 111128325A TW 111128325 A TW111128325 A TW 111128325A TW 202243614 A TW202243614 A TW 202243614A
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Images
Classifications
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- B08B1/50—Cleaning by methods involving the use of tools involving cleaning of the cleaning members
- B08B1/52—Cleaning by methods involving the use of tools involving cleaning of the cleaning members using fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B24B37/00—Lapping machines or devices; Accessories
- B24B37/34—Accessories
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
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- C11D3/2086—Hydroxy carboxylic acids-salts thereof
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
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- C11D3/3765—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions in liquid compositions
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
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- C11D7/04—Water-soluble compounds
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Abstract
本發明描述自聚合物表面,諸如自化學機械後處理清潔步驟中所使用之清潔刷的聚合物表面移除磨料顆粒之方法,以及相關的清潔溶液。
Description
本發明係關於自聚合物表面,諸如自化學機械後處理清潔步驟中所使用之清潔刷之聚合物表面移除磨料顆粒之方法。
在與微電子器件之生產(製造)有關的技術領域中,該微電子器件包括積體電路、光學器件、記憶體器件、磁電元件及用於電子、記憶體、光學及類似應用中的其他微器件或微器件元件,微電子器件藉由包括自基板表面精確移除材料之步驟來製備。用於製備某些器件之方法可以包括在基板表面沈積及選擇性地移除不同材料之一系列步驟。在處理期間所應用之材料可為導電材料,諸如金屬、半導體材料,諸如矽基材料(例如氧化矽)、介電層或聚合物材料等。該等材料可在表面處以在基板上構建微電子結構層之方式來選擇性地應用及選擇性地移除。可藉由選擇性化學手段、研磨手段或此等手段之組合來移除材料。
在製備此等器件中,通常使用藉由研磨手段來平坦化、平整化或拋光基板表面之處理步驟。在選擇性地在表面處應用及移除材料的步驟之間,對表面進行處理,以提供高度精細化(例如平整化、平坦化或拋光)之光潔度。用於該處理之標準技術為化學機械處理(chemical - mechanical processing,CMP)。在化學機械處理中,使基板表面與磨料漿液及CMP墊接觸,該墊與該表面之間有相對移動。該漿液含有液體載體(水或有機溶劑)、溶解的化學物質(亦即有機化學材料)及分散的磨料顆粒。(表面通常將包括粒狀副產物,諸如各種類型之金屬氧化物,其自先前的處理步驟中出現。)漿液成分之組合以及墊與基板表面之間的移動可有效地自基板表面移除材料,並提供經平坦化或拋光之表面以供進一步處理。
在CMP步驟之後,為漿液之一部分的各種材料,以及已經自基板表面移除之材料,以化學物質或研磨殘餘物之形式殘留在基板表面處。化學殘餘物可為CMP處理後存在於基板表面處之殘餘化學成分,並且其為最初存在於CMP漿液中之化學材料或其衍生物(例如反應產物)。磨料顆粒殘餘物係指最初存在於CMP漿液中且在CMP步驟結束時殘留在基板表面處之磨料顆粒。其他類型之殘餘物可為磨料顆粒及化學殘餘物之組合,諸如聚結、凝結或沈澱的有機及磨料顆粒材料。
在處理微電子器件期間,例如,在CMP步驟之後或之間,作出了大量努力,以自基板表面移除殘餘物。特定言之,必須自基板表面移除呈殘餘磨料顆粒形式之殘餘物,因為殘餘磨料顆粒會導致表面缺陷諸如刮痕,以及呈嵌入顆粒形式之器件缺陷,該等缺陷可能對基板之下游處理或下游產物之品質產生負面影響。移除包括殘餘磨料顆粒之殘餘物之方法包括有時被稱作「後CMP清潔」技術、方法或步驟之清潔技術。此等方法涉及使用應用於包括殘餘物之基板表面的清潔溶液,以及藉由移動式聚合物刷之接觸,以自表面以化學及機械方式移除殘餘物。
市面上可購得多種後CMP清潔設備及清潔溶液。示例裝置包括含有移動刷之清潔室以及在該清潔室內將清潔溶液分配於基板表面上並提供基板與刷之間的運動及接觸的系統。通常可以加熱該室以便於清潔。在使用中,將清潔溶液應用於基板表面,並使表面與移動刷接觸,以移除殘餘物。儘管此等類型之裝置及方法之實例為吾人所知、為商用的且能夠對各種基板進行高效及有效的後CMP清潔,但始終需要對現有技術進行改進,並開發新的甚至更有效的清潔溶液及清潔方法,以自CMP基板表面移除殘餘物。
本發明係關於可用於自聚合物表面,諸如自化學機械後處理清潔步驟中所使用之清潔刷之聚合物表面移除磨料顆粒的方法及組合物,以及相關的清潔溶液。本申請人已確定磨料顆粒,尤其係具有在顆粒表面之氫鍵合基團、在後CMP清潔步驟中所使用之清潔溶液中的正電荷(正ζ電位(ζ電位))或此兩者之彼等,在後CMP清潔步驟期間可被存在於清潔刷之聚合物表面處的氫鍵合基團所吸引。
在處理微電子期間基板期間,在後CMP清潔步驟之前,微電子器件基板在其表面處可能具有殘餘物,諸如殘餘磨料顆粒。在後CMP清潔步驟期間,彼等磨料顆粒自基板表面移除(至少大部分),並變為分散於用於後CMP清潔步驟之清潔溶液中。在清潔溶液中,尤其係在低pH (例如低於6或7)之條件下時,分散的磨料顆粒可以呈現正電荷,亦即正ζ電位。磨料顆粒之表面亦可包括氫鍵合基團,諸如(-OH)基團,例如在矽石顆粒之情況下之矽烷醇(-SiOH)基團。其上具有氫鍵合基團之帶正電顆粒之表面被靜電吸引至後CMP清潔步驟中所使用的聚合物刷的表面處,並且可與存在於該處之氫鍵合基團形成氫鍵。磨料顆粒可被吸引至聚合物刷之表面處並且可在該處積聚,並且特別係在存在pH較低的清潔溶液之情況下,可藉由氫鍵合維持與表面之吸引力。在後CMP清潔步驟期間,在清潔刷表面處存在及積聚磨料顆粒之一種潛在結果可能為在後CMP清潔步驟之後出現刷痕。
如本文中所用,「氫鍵合基團」,例如作為顆粒移除劑、刷子之聚合物表面或磨料顆粒之特徵,為能夠與另一氫鍵合基團相互作用以形成氫鍵之極性化合物或極性基團。實例包括基團,其包括與高負電性原子諸如氮(N)、氧(O)、硫(S)或氟(F)共價鍵結之氫(H)原子。某些特定的氫鍵合基團包括:羧酸基、胺基、醇基、膦基、磷酸根、膦酸根、烷醇胺基、碳醯胺基、脲基、胺基甲酸酯基、酯基、甜菜鹼基團、矽烷醇基或含硫基團。
根據目前所描述之清潔溶液及其使用方法,清潔溶液包括溶解的化學成分,稱作顆粒移除劑,其有效地在後CMP清潔步驟期間,防止清潔漿液中帶正電之磨料顆粒與聚合物刷表面之間形成氫鍵;在後CMP清潔步驟期間抑制或減少在該等磨料顆粒與聚合物刷表面之間形成氫鍵;或移除被吸引至聚合物刷之表面並已與該表面形成氫鍵之該等磨料顆粒(在後CMP清潔步驟期間,抑或在不存在基板之情況下,在清潔刷子之單獨步驟中)。
在一態樣中,本發明係關於一種自化學機械後處理(後CMP)清潔刷中移除磨料顆粒之方法。該方法包括:提供具有聚合物表面且在該聚合物表面處具有磨料顆粒殘餘物之後CMP清潔刷;及提供pH低於7之清潔溶液。清潔溶液含有:清潔劑,及顆粒移除劑。該方法亦包括藉由使聚合物表面與清潔溶液接觸來自聚合物表面移除磨料顆粒殘餘物。
在另一態樣中,本發明係關於一種基板之化學機械後處理(後CMP)清潔之方法。該方法包括:提供具有聚合物表面之後CMP清潔刷;及提供清潔溶液,其包括:清潔劑,及顆粒移除劑。該方法亦包括提供包括表面之基板,其中在基板表面處具有殘餘物,該殘餘物包括磨料顆粒;及藉由將基板表面及聚合物表面曝露於清潔溶液中,同時使基板表面與聚合物表面接觸並且同時使基板表面相對於聚合物表面移動,自基板表面移除殘餘物。
在另一態樣中,本發明係關於一種在化學機械後處理步驟中可用於清潔基板之清潔溶液濃縮物。該清潔溶液濃縮物包括清潔劑,及包括氫鍵合基團之至少0.1重量%之顆粒移除劑。
在不同態樣中,本說明書係關於:自在後CMP清潔步驟中所使用之清潔刷之表面移除磨料顆粒的方法(該方法被併入後CMP清潔處理中,或為自刷子中移除磨料顆粒之單獨方法或步驟);防止在後CMP清潔處理中在清潔刷之表面上積聚磨料顆粒,以自基板表面移除殘餘物之方法;且係關於在此等方法中有效之清潔溶液,其中清潔溶液含有顆粒移除劑。
在化學機械處理,亦即CMP或「CMP處理」期間,藉由控制自表面移除少量材料,對基板進行處理以使其平坦化或拋光基板之表面。微電子器件基板,亦即簡稱為「基板」,可為任何類型之微電子器件或其前驅體,意謂為或含有以下各者中之任一者的器件或前驅體:積體電路、光學器件、固態記憶體器件、硬碟記憶體器件、磁電元件或另一類型之微器件或微器件元件,其可用於電子、記憶體、光學或類似應用且其藉由包括以下步驟中之一或多者之製造過程來製備:對基板之表面進行化學機械處理,其常常具有多個在基板表面處沈積及選擇性地移除材料組合之步驟。
用於如所描述之方法中之基板可包括在表面處的為製程內微電子器件的一部分的任何材料或材料組合,其包括:半導體材料(例如矽)、陶瓷(例如碳化矽、氮化矽)、玻璃材料、導電材料(例如金屬及金屬合金)、電絕緣(介電質)材料、隔絕材料及其類似物。導電材料可為包括銅、鎢、銀、鋁及鈷之金屬或金屬合金,以及其他金屬及其合金。電絕緣介電材料可為各種目前已知的或待開發的絕緣、低k或超低k介電材料中之任一種,僅列舉幾個實例,其包括各種形式之摻雜或多孔二氧化矽、熱氧化物、TEOS。可以隔絕層形式存在之基板材料之實例包括:鉭、氮化鉭、氮化鈦、鈷、鎳、錳、釕、氮化釕、碳化釕或氮化釕鎢。
CMP處理涉及將漿液應用於基板表面,並使漿液及基板與墊(亦即「CMP墊」或「CMP拋光墊」)接觸,墊與表面之間具有移動。漿液含有經設計以使得自基板表面摩擦(機械)移除材料之磨料顆粒。漿液通常將亦含有溶解於其中之各種化學成分,其可有效地控制(提高或降低)自基板表面移除某些材料之速率;以提供所需之移除不同材料之選擇性;以在CMP步驟期間及之後減少基板表面處缺陷之存在及殘餘物之量;或以其他方式促進與CMP處理之效能或在CMP處理結束時基板之品質相關的改進或期望的結果。
示例漿液(「CMP漿液」)包括液體載劑,其大部分為化學材料及磨料顆粒溶解或分散在其中之水(較佳為去離子水)。可選擇漿液之化學材料,以達到所需移除率、移除之選擇性及成品基板表面之最終表面形貌(例如光滑度、波紋度等)。特定漿液中化學材料之具體類型及量取決於各種因素,諸如存在於基板表面處之材料的一或多種類型、CMP加工條件、CMP步驟中所使用之CMP墊的類型、漿液之磨料顆粒的一或多種類型等。示例化學成分包括化學材料,諸如可充當溶劑、界面活性劑、觸媒、穩定劑、氧化劑(oxidizer)、有機抑制劑(以控制移除率)、螯合劑等等之彼等。其他可能的化學材料包括pH調節劑(鹼、酸)、腐蝕抑制劑及殺生物劑(作為防腐劑)。
磨料顆粒可具有大小及組成特徵,以實現自基板表面高效、視情況選擇性且均勻地移除特定材料。示例磨料顆粒可由氧化鋁、鈰氧、二氧化鈰、鋯、氧化鋯、矽石(各種形式)、二氧化鈦、二氧化鋯、金剛石、碳化矽或其他金屬、陶瓷或金屬氧化物材料製成或含有該等材料。各種大小、大小分佈、顆粒形狀及其他物理或機械性質之此等類型之磨料顆粒均為可用的,且可以選擇供與各種基板或CMP處理一起使用。漿液中磨料顆粒之量亦可基於與所處理的基板之類型及CMP處理的特徵有關的類似因素來選擇。
為了用於處理不同類型之基板,當顆粒分散於CMP漿液中時,可選擇磨料顆粒以呈現可為正電荷或負電荷之靜電電荷。分散的磨料顆粒之電荷強度通常被稱作顆粒之「ζ電位」 (或動電位),其係指圍繞顆粒之離子的電荷與漿液之主體液體的電荷(例如液體載劑及溶解於其中之任何其他組分)之間的電位差。分散的顆粒之ζ電位通常取決於顆粒分散在其內的液體介質之pH。對於給定的漿液或其他液體介質,帶電磨料顆粒之ζ電位在其下為零之pH被稱作等電點。當含有分散的磨料顆粒之溶液之pH在遠離等電點處增加或減小時,表面電荷(且因此ζ電位)相應地減少或增加(至更高的負或更高的正ζ電位值)。
在CMP處理步驟期間,漿液中存在各種材料,其包括漿液之溶解及分散(例如懸浮)成分,以及在CMP處理期間,諸如藉由自基板表面移除所產生之其他溶解或分散的材料。另外存在的可為此等材料之衍生物、反應產物、聚結物、凝結物及沈澱物。在CMP處理步驟期間存在於漿液中之任何該材料均可能成為在CMP處理步驟結束時殘留在基板表面處之殘餘物。因此,在CMP步驟之後基板表面處之殘餘物可包括:最初存在於CMP漿液中之溶解的化學材料或固體磨料顆粒;在處理期間自基板表面移除之材料(例如金屬離子)或在處理期間藉由漿液之化學材料的反應或化學改質(例如氧化或還原)所產生的材料;或此等之組合,包括沈澱物、聚結物及凝結物。
眾所周知,在CMP處理步驟之後,各種後CMP清潔步驟可用於移除存在於微電子器件表面上之殘餘物。此等清潔步驟可以使用並且通常確實涉及使用特門的後CMP清潔設備,該設備可以包括清潔裝置,其包括其中清潔溶液被輸送至基板表面之清潔室,以及將移動式聚合物刷施加於表面以機械地自基板表面移除殘餘物。可以基於諸如基板類型、刷子類型、表面處之殘餘物類型及量、清潔溶液類型等之因素來選擇條件及清潔時間(意謂基板表面曝露於移動刷及清潔溶液的時間量)。
涉及使用聚合物刷之各種後CMP清潔工具為吾人所知且可市面上購得。此等裝置通常包括清潔室,該清潔室包括可移動的清潔刷(通常為多個清潔刷);清潔溶液源;熱源;及系統、機構、器件,包括適於在有效地使得自表面機械移除殘餘物之條件(時間及溫度)下將清潔溶液與基板、清潔溶液及移動刷接觸之控制系統。出售此類設備之公司包括:Entegris, Inc.;AION;Ceiba Technologies, Inc.;Rippey Corp.;Applied Materials;Ebarra等等。
用於根據本說明書之後CMP清潔裝置及方法的聚合物清潔刷包括含有氫鍵合基團,例如連接至聚合物主鏈之羥基(-OH)的聚合物表面。包括聚合物表面且可用於後CMP清潔處理之清潔刷為吾人所熟知。含有羥基連接至聚合物主鏈之聚合物表面的清潔刷之實例包括由聚合物製成的刷子,該聚合物至少部分地衍生自乙烯醇,亦即為乙烯醇之均聚物抑或共聚物的聚合物,此類聚合物(共聚物及均聚物)通常稱作聚乙烯醇(亦稱為「PVOH」或「PVA」)。
在美國專利申請案20013/0048018中描述了用於後CMP清潔步驟之清潔刷之實例,該申請案以全文引用之方式併入本文中。如其中所描述,清潔刷可藉由使用聚乙烯醇作為起始材料,然後可對其進行處理以形成聚乙烯縮醛彈性材料來製備。可以用醛例如甲醛處理聚乙烯醇起始材料以產生聚乙烯醇刷材料。其他聚合物,代替聚乙烯醇抑或除了聚乙烯醇之外,均可用作刷子之聚合物材料且可包括氫鍵合基團。該等其他聚合物之實例包括聚合物及共聚物耐綸、聚氨酯及此等之組合,其可形成適合於在商業化後CMP清潔處理中,如本文中所描述自基板清潔殘餘物之清潔刷。
示例刷子包括圓柱形聚合物(如所描述)泡沫刷,其具有第一端及第二端,及具有複數個自刷子之底部表面延伸的結節之外表面。結節沿著刷子之長度位於第一與第二端之間,並藉由間隙或開口而彼此分隔。結節可具有任何形狀且通常包括圓形頂面及自刷子底部延伸至結節頂面之表面高度。當刷子繞著在第一與第二端之間延伸的軸線旋轉時,刷子的外圓柱形表面旋轉,表面上之結節亦旋轉。可以使具有應用於其上之清潔溶液的基板表面與刷子的移動表面及刷子結節接觸,以使結節與表面接觸,以便於自表面移除殘餘物。
清潔處理之時間及條件應有效地以高效的方式自基板表面移除大部分之殘留物總量(例如,如藉由磨料顆粒殘餘物所量測)。例如,藉由使用典型的後CMP清潔裝置及方法,可使清潔溶液與基板表面接觸,並且該表面將與聚合物刷接觸(在基板表面與刷子之間具有移動)達足以在清潔步驟之前移除存在於表面處之高百分比殘餘物(例如磨料顆粒殘餘物)的時間。期望地,有用的後CMP清潔步驟可導致在移除殘餘物之前移除至少85%存在於基板表面上之殘餘物(例如磨料顆粒殘餘物),更佳為至少90%、甚至更佳為至少95%且最佳為至少99%。可用於量測殘留在基板表面處之殘餘物(例如顆粒殘餘物)之量的方法及設備為吾人所熟知,且可市面上購得。
為了達到該位準之殘餘物移除,在約20攝氏度至約90攝氏度、較佳為約20至約50攝氏度之範圍內的溫度下,清潔裝置對基板之示例清潔時間可在約1秒至約20分鐘、較佳約5秒至10分鐘之範圍內,例如,在約15秒至約5分鐘之範圍內。在此等時間及溫度範圍內之處理時間為說明性的,並且若可有效地自基板表面至少部分地清潔後CMP殘餘物,則可使用任何其他合適的時間及溫度條件。
根據本發明,本申請人現在已明確地確認磨料顆粒,尤其係具有在顆粒表面處之氫鍵合基團、在後CMP清潔步驟中所使用之清潔溶液中的正電荷(正ζ電位)或此兩者之彼等,在後CMP清潔步驟期間可被存在於清潔刷之聚合物表面處的氫鍵合基團所吸引。
在後CMP清潔步驟之前,微電子器件基板在其表面處可以具有磨料顆粒殘餘物。在清潔步驟期間,彼等磨料顆粒自基板表面移除(至少大部分地),並變為分散於用於後CMP清潔步驟之清潔溶液中。在清潔溶液中,尤其係在低pH (例如低於6或7)之條件下時,分散的磨料顆粒可以呈現正電荷,亦即正ζ電位。磨料顆粒之表面亦可包括氫鍵合基團,諸如(-OH)基團,例如在矽石顆粒之情況下之矽烷醇(-SiOH)基團。其上具有氫鍵合基團之帶正電顆粒之表面被靜電吸引至後CMP清潔步驟中所使用的聚合物刷的表面處,並且可與存在於該處之氫鍵合基團形成氫鍵。磨料顆粒可被吸引至聚合物刷之表面處並且可在該處積聚,並且特別係在存在pH較低的清潔溶液之情況下,可藉由氫鍵合維持與表面之吸引力。
在後CMP清潔步驟期間,在清潔刷表面處存在及積聚磨料顆粒之一種潛在結果可能為在後CMP清潔步驟之後出現刷痕。刷痕(或「刷印」)為後CMP清潔步驟之後存在於基板表面上之殘餘磨料顆粒的可見圖案。該圖案可包括與用於清潔基板表面之清潔刷之表面形狀或特徵,諸如清潔刷結節之圓形表面相匹配的形狀或特徵(例如尺寸)。由殘餘磨料顆粒所形成之刷痕圖案之實例包括與結節的形狀及大小相匹配的圓形痕跡,以及為由殘餘磨料顆粒形成之明顯線條之線圖案,其中線條之長度對應於圓形刷結節之直徑。刷痕可由在後CMP清潔步驟之後殘留在基板上之磨料顆粒(亦即磨料顆粒殘餘物)的圖案構成並由其形成。本說明書之較佳後CMP清潔過程可導致在後CMP清潔步驟之後,基板表面上之刷痕減少或最小化,或較佳為不存在。
根據本發明之示例方法,後CMP清潔步驟涉及包括具有含有氫鍵合基團之聚合物表面之擦洗刷的裝置。另外,清潔步驟中所使用之清潔溶液可具有低pH,諸如低於約7,例如在約1至約5或6、或約1或2至約3、3.5或4之範圍內。此等因素會導致在後CMP清潔步驟期間清潔溶液中存在帶正電之磨料顆粒(具有氫鍵合基團),其中帶正電之磨料顆粒會被刷子表面處之氫鍵合基團吸引,從而導致帶正電之磨料顆粒藉由氫鍵合被吸引至聚合物刷表面。
根據申請人之新穎及本發明清潔溶液及其使用方法,清潔溶液包括溶解的化學成分,稱作顆粒移除劑,其有效地:在後CMP清潔步驟期間,防止清潔漿液中帶正電之磨料顆粒與聚合物刷表面之間形成氫鍵;在後CMP清潔步驟期間抑制或減少在該等磨料顆粒與聚合物刷表面之間形成氫鍵;或移除被吸引至聚合物刷之表面並已與該表面形成氫鍵之該等磨料顆粒(在後CMP清潔步驟期間,抑或在不存在基板之情況下,在清潔刷子之單獨步驟中)。
因此,本說明書之清潔溶液包括溶液或處於溶液形式,該溶液包括含有經溶解成分之水性介質(較佳為去離子水),該經溶解成分包括:顆粒移除劑、視情況選用之一或多種充當清潔劑之成分(例如螯合劑、有機溶劑);及視情況,少量或微量其他視情況選用之佐劑,諸如酸、界面活性劑、殺生物劑等。
顆粒去移除劑為化學化合物(包括寡聚物或聚合物),其包括至少一個氫鍵合基團,並且當存在於如所描述之清潔溶液中,並且在存在帶正電之磨料顆粒及清潔刷之聚合物表面時,該化學化合物可以有效地與:聚合物刷表面之氫鍵合基團、帶正電之磨料顆粒的氫鍵合基團或此兩者結合,其方式及程度使顆粒移除劑將減少存在於清潔刷表面並藉由氫鍵合吸引至清潔刷表面之磨料顆粒之量。
在含有例如在低pH下帶正電之分散的磨料顆粒(以殘餘物形式帶到基板表面上)之清潔溶液中,顆粒移除劑可以抑制或防止帶正電之顆粒被存在於聚合物清潔刷表面處的氫鍵合基團所吸引的方式與帶正電之顆粒的氫鍵合基團結合。另外,在存在包括氫鍵合基團之清潔刷之情況下,並且在低pH下,顆粒移除劑亦可以抑制或防止清潔刷吸引存在於清潔溶液中之帶正電之磨料顆粒的方式,與存在於清潔刷表面處之氫鍵合基團相關聯。更一般化地考慮,顆粒移除劑可以防止或破壞包括氫鍵合基團之帶正電磨料顆粒與含有氫鍵合基團的清潔刷的聚合物表面之間的氫鍵。顆粒移除劑與清潔刷表面,及顆粒移除劑與均存在於清潔溶液中(例如在後CMP清潔步驟期間)的帶正電之磨料顆粒之間的此等效應及相互作用(單獨或呈組合形式),有效地減少清潔刷表面的氫鍵合基團與帶正電之磨料顆粒的氫鍵合基團之間的相互作用量。結果可為,較少的磨料顆粒將存在於清潔刷表面處,並藉由氫鍵合與表面結合。
因此,本發明之清潔溶液包括一定量的顆粒移除劑,當在存在該等磨料顆粒之情況下且在低pH下清潔溶液曝露於清潔刷時,該量及類型可有效地減少存在於清潔刷之聚合物表面的帶正電之磨料顆粒的量(例如濃度)。
可適用作如所描述之顆粒移除劑的成分之實例包括有機化合物、聚合物、寡聚物等,其含有一或多個氫鍵合基團(當存在於清潔溶液中且在低pH下時),並且其可以包括於清潔溶液中以有效地減少在如所描述之聚合物清潔刷的表面處帶正電之磨料顆粒的存在。示例化合物通常包括含氮化合物;胺基酸;含單、二或多羧酸鹽之群組;醇(例如多元醇);酸等等。
顆粒移除劑之一些具體實例包括非離性、陰離子、陽離子及兩性離子小分子,及在中性pH下可表現為聚電解質之聚合物。陰離子聚合物或陰離子聚電解質可為天然、經改質之天然聚合物或合成聚合物。可包括於如所描述之清潔溶液中之例示性天然及經改質之天然陰離子聚合物包含但不限於:褐藻酸(或鹽)、羧甲基纖維素、硫酸葡聚糖、聚(半乳糖醛酸)及其鹽。例示性合成陰離子聚電解質包含但不限於:(甲基)丙烯酸(或鹽)之均聚物或共聚物、聚(丙烯酸)、順丁烯二酸(或酸酐)、苯乙烯磺酸(或鹽)、乙烯基磺酸(或鹽)、烯丙基磺酸(或鹽)、丙烯醯胺基丙基磺酸(或鹽)及其類似物,其中羧酸及磺酸之鹽較佳經銨或烷基銨陽離子中和。聚電解質陰離子聚合物之較佳陽離子為銨陽離子(NH
4 +)、膽鹼離子(cholinium)
+N(CH
3)
3(CH
2CH
2OH)及
+N(CH
3)
4。因此,較佳的經合併之合成及天然聚電解質陰離子聚合物之實例為(甲基)丙烯酸之均聚物或共聚物、順丁烯二酸(或酸酐)、苯乙烯磺酸、乙烯基磺酸、烯丙基磺酸、乙烯基膦酸、丙烯醯胺基丙基磺酸、褐藻酸、羧甲基纖維素、硫酸葡聚糖、聚(半乳糖醛酸)及其鹽。
陽離子聚合物及陽離子聚電解質可為天然、經改質之天然聚合物或合成聚合物。例示性天然及經改質之天然陽離子聚合物包含但不限於:聚葡萄胺糖、陽離子澱粉、聚離胺酸及其鹽。例示性陽離子合成聚電解質包括但不限於:二烯丙基二甲基氯化銨(DADMAC)、二烯丙基二甲基溴化銨、二烯丙基二甲基硫酸銨、二烯丙基二甲基磷酸銨、二甲烯丙基二甲基氯化銨、二乙基丙烯基二甲基氯化銨、二烯丙基二(β-羥乙基)氯化銨、二烯丙基二(β-乙氧基乙基)氯化銨、二甲胺基乙基(甲基)丙烯酸酯酸加成鹽及四級鹽、二乙胺基乙基(甲基)丙烯酸酯酸加成鹽及四級鹽、7-胺基-3,7-二甲基辛基(甲基)丙烯酸酯酸加成鹽及四級鹽、N,N'-二甲胺基丙基丙烯醯胺酸加成鹽及四級銨化鹽之均聚物或共聚物,其中該等四級鹽包括烷基及苯甲基四級銨化鹽;烯丙胺;二烯丙胺;乙烯胺(藉由乙烯基烷基醯胺聚合物之水解獲得);乙烯基吡啶;聚葡萄胺糖;陽離子澱粉;聚離胺酸及其鹽。
其他實例包括2-吡咯啶酮、1-(2-羥乙基)-2-吡咯啶酮(HEP)、丙三醇、1,4-丁二醇、伸丁基碸(環丁碸)、二甲碸、乙二醇、丙二醇、二丙二醇、四乙二醇二甲醚、二乙二醇二甲醚、二醇醚(例如二乙二醇單甲醚、三乙二醇單甲醚、二乙二醇單***、三乙二醇單***、乙二醇單丙醚、乙二醇單丁醚、二乙二醇單丁醚(DEGBE)、三乙二醇單丁醚(TEGBE)、乙二醇單己醚(EGHE)、二乙二醇單己醚(DEGHE)、乙二醇苯基醚、丙二醇甲醚、二丙二醇甲醚(DPGME)、三丙二醇甲醚(TPGME)、二丙二醇二甲醚、二丙二醇***、丙二醇正丙醚、二丙二醇正丙醚(DPGPE)、三丙二醇正丙醚、丙二醇正丁醚(DOWANOL PnB)、二丙二醇正丁醚、三丙二醇正丁醚、丙二醇苯基醚(DOWANOL PPh))、正乙基吡咯啶酮、正甲基吡咯啶酮、二甲基甲醯胺、二甲亞碸、乙二醇單己醚、二乙二醇單己醚及其組合。替代地,或另外地,清潔添加劑可包括羥丙基纖維素;羥乙基纖維素;羥乙基甲基纖維素;羥丙基甲基纖維素;羧甲基纖維素;羧甲基纖維素鈉(Na CMC);聚乙烯吡咯啶酮(PVP);使用N-乙烯吡咯啶酮單體、聚丙烯酸酯及聚丙烯酸酯之類似物製成的任何聚合物;聚胺基酸(例如聚丙胺酸、聚亮氨酸、聚甘胺酸);聚胺基羥基胺甲酸乙酯;聚內酯;聚丙烯醯胺;三仙膠;聚葡萄胺糖;聚環氧乙烷;聚乙烯醇(PVA);聚乙酸乙烯酯;聚丙烯酸;聚乙亞胺(PEI);糖醇,諸如山梨糖醇、蔗糖、果糖、乳糖、半乳糖、麥芽糖、赤藻糖醇、麥芽糖醇、蘇糖醇、阿糖醇(arabinol)、核糖醇、甘露醇、半乳糖醇、肌醇及木糖醇;去水山梨糖醇之酯;二級醇乙氧基化物,諸如TERGITOL;多功能醇,其包括新戊四醇、二新戊四醇(dipentaerythitol)、三羥甲基丙烷、二甲基丙酸及木糖酸;核鹼基,諸如尿嘧啶、胞嘧啶、鳥嘌呤、胸嘧啶,及其組合。
又其他實例包括乳酸、順丁烯二酸、脲、乙醇酸、山梨糖醇、硼砂(亦即硼酸鈉)、脯胺酸、甜菜鹼、甘胺酸、組胺酸、三(三(羥甲基)胺基甲烷)、二甲亞碸、環丁碸、丙三醇、SDS (十二烷基硫酸鈉)、十二烷基膦酸或其組合。在此等中,某些顆粒移除劑可較佳用於微電子器件基板之後CMP清潔步驟中,例如:順丁烯二酸、硼砂(亦即硼酸鈉)、二甲亞碸、丙三醇或其組合。
根據某些示例清潔溶液,以清潔溶液之總重量計,使用時(在後CMP清潔處理期間)清潔溶液中一或多種顆粒移除劑之總量可為至少約0.01重量%,更佳為至少約0.02重量%,諸如至少0.05重量%。以清潔溶液之總重量計,示例量可為至多約1重量%、更佳為至多約0.3重量%,例如至多約0.2重量%之顆粒移除劑。
根據某些在稀釋成使用點組合物之前呈濃縮形式之示例清潔溶液,清潔溶液濃縮物中一或多種顆粒移除劑之總量以清潔溶液之總重量計可為至少約7%,諸如至少約10重量%,但以清潔溶液之總重量計不超過20重量%,較佳不超過8重量%,例如不超過7重量%之顆粒移除劑。
除了顆粒移除劑之外,如所描述之清潔組合物可較佳包括一或多種其他溶解的化學成分,其例如,在後CMP清潔步驟期間,充當清潔劑以幫助自基板表面移除殘餘物。一或多種清潔劑可藉由各種已知的清潔或隔離機制起作用,諸如藉由溶解作為有機材料之殘餘物、藉由分散固體或粒狀殘餘物、或藉由其他方式與殘餘物相互作用或分離,該殘餘物在CMP步驟之後存在於基板表面處,或其在後CMP清潔步驟期間存在於用於清潔基板之清潔溶液中。
已知適用的有機溶劑之實例用於後CMP清潔溶液及方法中。示例溶劑可為極性有機溶劑、醇、二醇及胺等等。非限制性實例包括低分子量醇,諸如C
1至C
4烷基醇、伸烷基二醇、乙醇胺(例如單乙醇胺)、N,N'-二甲基甲醯胺、二甲亞碸、N-甲基吡咯啶酮、N-乙基吡咯啶酮等。
有機胺之說明性實例包括具有通式NR
1R
2R
3之種類,其中R
1、R
2及R
3可彼此相同或不同,並且選自由以下組成之群:氫、直鏈或分支鏈C
1-C
6烷基(例如甲基、乙基、丙基、丁基、戊基及己基)、直鏈或分支鏈C
1-C
6醇(例如甲醇、乙醇、丙醇、丁醇、戊醇及己醇)及具有式R
4-O-R
5之直鏈或分支鏈醚,其中R
4及R
5可彼此相同或不同,並且選自由如上所定義之C
1-C
6烷基組成之群。當胺包括醚組分時,該胺可視為烷氧基胺。最佳地,R
1、R
2及R
3中之至少一者為直鏈或分支鏈C
1-C
6醇。實例包括但不限於烷醇胺,諸如烷醇胺,諸如胺基乙基乙醇胺、N-甲基胺基乙醇、胺基乙氧基乙醇、二甲基胺基乙氧基乙醇、二乙醇胺、N-甲基二乙醇胺、單乙醇胺、三乙醇胺、1-胺基-2-丙醇、3-胺基-1-丙醇、二異丙胺、異丙胺、2-胺基-1-丁醇、異丁醇胺、二異丙醇胺、三(羥甲基)胺基甲烷(TRIS)、三(羥乙基)胺基甲烷、其他C
1-C
8烷醇胺及其組合;胺,諸如三伸乙二胺、乙二胺、己二胺、二伸乙基三胺、三乙胺、三甲胺及其組合;二甘醇胺;嗎啉;及胺與烷醇胺之組合。較佳地,有機胺包含單乙醇胺。
一般而言,有機溶劑可以有用的量包括於清潔溶液中,該量可以本文中所描述之有機溶劑作為清潔劑之方式有效,例如藉由溶解有機殘餘物。包括於給定的清潔溶液中之特定類型及量之有機溶劑可以基於包括以下的因素來選擇:被清潔之基板的類型、存在於基板表面處之殘餘物的類型及量、清潔溶液中的其他成分,及後CMP清潔處理中所使用之條件(時間、溫度等)。
根據某些示例清潔溶液,使用時(在後CMP清潔處理期間)清潔溶液中一或多種有機溶劑之總量以清潔溶液之總重量計可低於約1重量%,更佳低於約0.33重量%,最佳不超過0.13重量%,例如,以清潔溶液之總重量計不超過0.067重量%,或不超過0.033重量%。較佳地,若存在,有機溶劑之量以清潔溶液之總重量計可為至少0.0003重量%,更佳為至少0.001重量%,例如,至少0.015或0.025重量%。
根據某些在稀釋成使用點組合物之前呈濃縮形式之示例清潔溶液,清潔溶液濃縮物中一或多種有機溶劑之總量以清潔溶液之總重量計可為不超過20重量%,更佳不超過10重量%,最佳不超過7重量%,例如,不超過2重量%,或不超過1重量%。較佳地,若存在,適用量以清潔溶液之總重量計可為至少0.005重量%,更佳為至少0.01重量%,諸如至少0.05重量%或至少0.2或0.35重量%。
清潔溶液可視情況含有至少一種螯合劑。一般而言,在後CMP清潔組合物中所使用之螯合劑為化合物,其通常與金屬離子,通常為鐵離子形成錯合物分子,以使清潔溶液內之離子失活並防止藉由該離子之化學反應或活性。已知各種螯合劑用於後CMP清潔組合物中,並且可用於本說明書之清潔組合物及方法中。某些具體實例包括含酸之有機分子,尤其係含羧酸之有機分子,諸如直鏈或分支鏈C
1-C
6羧酸化合物,其包括鄰苯二甲酸、丁二酸、檸檬酸、酒石酸、蘋果酸、葡糖酸、天冬胺酸或其組合,以及甘胺酸、胺基酸及其類似物。檸檬酸可為用於螯合鐵離子(例如Fe
+ 2、Fe
+ 3)之較佳螯合劑。糖醇諸如:***糖醇、赤藻糖醇、丙三醇、經氫化之澱粉水解產物(HSH)、異麥芽酮糖醇(isomalt)、乳糖醇、麥芽糖醇、甘露醇、山梨糖醇及木糖醇亦為金屬離子的較佳螯合試劑。
本文中所涵蓋之其他金屬螯合試劑包括但不限於乙酸、丙酮肟、丙烯酸、己二酸、丙胺酸、精胺酸、天冬醯胺、天冬胺酸、甜菜鹼、二甲基乙二肟、甲酸、反丁烯二酸、葡糖酸、麩胺酸、麩醯胺酸、戊二酸、甘油酸、丙三醇、乙醇酸、乙醛酸、組胺酸、亞胺二乙酸、間苯二甲酸、伊康酸、乳酸、白胺酸、離胺酸、順丁烯二酸、順丁烯二酸酐、蘋果酸、丙二酸、杏仁酸、2,4-戊二酮、苯乙酸、***酸、鄰苯二甲酸、脯胺酸、丙酸、鄰苯二酚、焦蜜石酸(pyromellitic acid)、奎尼酸、絲胺酸、山梨糖醇、丁二酸、酒石酸、對苯二甲酸、偏苯三甲酸、均苯三甲酸(trimesic acid)、酪胺酸、纈胺酸、木糖醇、乙二胺、草酸、鞣酸、吡啶甲酸、1,3-環戊二酮、兒茶酚、五倍子酚、間苯二酚、氫醌、三聚氰酸、巴比妥酸、1,2-二甲基巴比妥酸、丙酮酸、丙硫醇、苯甲羥肟酸、四伸乙基五胺(TEPA)、4-(2-羥乙基)嗎啉(HEM)、N-胺基乙基哌𠯤(N-AEP)、乙二胺四乙酸(EDTA)、1,2-環己二胺-N,N,N',N'-四乙酸(CDTA)、N-(羥乙基)-乙二胺四乙酸(HEdTA)、亞胺二乙酸(IDA)、2-(羥乙基)亞胺二乙酸(HIDA)、氮基三乙酸、胺基三(亞甲基磷酸)、羥基乙叉二膦酸(hydroxyethylidine diphosphonic acid)、乙二胺四(亞甲基磷酸)、乙二胺五(亞甲基磷酸)、硫脲、1,1,3,3-四甲基脲、脲、脲衍生物、甘胺酸、半胱胺酸、麩胺酸、異白胺酸、甲硫胺酸、哌啶、N-(2-胺基乙基)哌啶、吡咯啶、蘇胺酸、色胺酸、柳酸、二吡啶甲酸、對甲苯磺酸、5-磺基柳酸及其組合。
適用的螯合劑之其他實例包括衍生自單體的含羧酸基之寡聚物及聚合物,該等單體可以包括以下中之一或多者:丙烯酸、甲基丙烯酸、順丁烯二酸、丁二酸、天冬胺酸、2-丙烯醯胺基-2-甲基-1-丙磺酸、丙烯醯胺、膦酸甲基丙烯醯胺基丙基三甲基氯化銨、烯丙基鹵化物或其組合。聚丙烯酸可為用於螯合氮化矽(silica nitride) (SiN)之較佳螯合劑。又其他實例包括:丙烷-1,2,3-三羧酸、丁烷-1,2,3,4-四羧酸、戊烷-1,2,3,4,5-五羧酸、偏苯三甲酸、均苯三甲酸(trimesinic acid)、焦蜜石酸、苯六甲酸及此等之組合。
一般而言,螯合劑可以有用的量包括於清潔溶液中,該量可以本文中針對螯合劑所描述之方式有效。包括於給定的清潔溶液中之特定類型及量之螯合劑可以基於包括以下的因素來選擇:被清潔之基板的類型、存在於基板表面處之殘餘物的類型、清潔溶液中的其他成分,及後CMP清潔處理之條件。
根據某些示例清潔溶液,使用時(在後CMP清潔處理期間)清潔溶液中一或多種螯合劑之總量可為至多約5重量%,諸如至多約2重量%,最佳為至多約1重量%。較佳地,若存在,量以清潔溶液之總重量計可為至少0.0005重量%,更佳為至少0.001重量%,諸如至少0.007重量%。
根據某些在稀釋成使用點組合物之前呈濃縮形式之示例清潔溶液,清潔溶液濃縮物中一或多種螯合劑之總量以清潔溶液之總重量計可為不超過20重量%,更佳不超過13重量%,最佳不超過10或7重量%,例如,不超過3重量%,或不超過1.5重量%。較佳地,量以清潔溶液之總重量計可為至少0.008重量%,更佳為至少0.015重量%,諸如至少0.1重量%或至少0.3重量%。
清潔溶液可視情況含有其他成分或佐劑,以改進使用清潔溶液之後CMP清潔步驟之清潔效應或效能。視情況,例如,清潔溶液可以包括pH調節劑或緩衝系統,以控制清潔溶液濃縮物或使用點組合物之pH。合適的pH調節劑之實例包括可有效降低pH之有機酸及無機酸,諸如硝酸、硫酸、磷酸、鄰苯二甲酸、檸檬酸、己二酸、草酸、甲磺酸、鹽酸、丙二酸、順丁烯二酸等等。其他可選成分包括界面活性劑(任何類型)或殺生物劑。
根據本說明書,相對於以相同方式(使用同樣的清潔裝置、刷子、清潔溶液量、清潔時間、清潔溫度等)、在相同基板(具有相當的殘餘物)上進行之相當的清潔方法,除了該相當的清潔方法之清潔溶液不含如本文中所描述之顆粒移除劑(包括其量),如所描述之併有含有如所描述之顆粒移除劑的清潔溶液的後CMP清潔方法,可用於在CMP步驟之後清潔基板,其較佳且有利地以導致後CMP清潔步驟結束時在基板表面處存在刷痕之發生降低的方式進行。根據本說明書之後CMP基板清潔方法之實施例,相對於在相同基板(具有相同或相當的殘餘物)上進行、使用在其他方面相同但不含顆粒移除劑之清潔溶液之在其他方面相同的後CMP清潔方法,使用如所描述之包括顆粒移除劑(例如以如所描述之量)的清潔溶液,會導致後CMP清潔處理結束時在基板表面上刷痕(尤其係線性刷痕)之存在減少(例如,減少至少50%、75%、90%或95%或99%)。
亦根據本說明書,相對於以相同方式(使用同樣的清潔裝置、刷子、清潔溶液量、清潔時間、清潔溫度等)、在相同基板(具有相當的殘餘物)上進行之相當的清潔方法,除了該相當的清潔方法之清潔溶液不含顆粒移除劑(例如以如本文中所描述之量),如所描述之併有如所描述之清潔溶液的後CMP清潔方法,該清潔溶液含有如所描述之顆粒移除劑(包括如所描述之量),會導致在清潔步驟期間或結束時存在於聚合物清潔刷表面處之磨料顆粒之量減少。根據本說明書之後CMP基板清潔方法之實施例,相對於在相同基板上進行、使用在其他方面相同但不含顆粒移除劑之清潔溶液之在其他方面相同的後CMP清潔方法,使用如所描述之清潔溶液,可以減少在後CMP清潔處理期間或結束時如所描述之存在於(例如藉由氫鍵合被吸引)聚合物清潔刷表面的磨料顆粒之存在(例如,減少至少50%、75%、90%或95%或99%)。
示例清潔溶液可用於移除存在於基板表面處之殘餘物,或減少清潔刷之聚合物表面處磨料顆粒之存在(亦即移除)或減少其積聚。在出於此等目的中之任一者來處理基板或刷子中,清潔溶液並非預期之清潔溶液或用於(如本文中所描述)移除構成基板表面層之材料。因此,如所描述之清潔溶液不需要且較佳地可不包括任何大量的適用且具有自基板表面移除材料之作用的化學材料或研磨材料,此等成分包括通常存在於經設計以用於CMP處理中以自基板表面移除材料之CMP漿液中之類型的研磨顆粒、氧化劑、界面活性劑、觸媒等。
如所描述之清潔溶液(在用於如本文中所描述之方法之前,呈最初的形式)可不包括可存在於CMP處理步驟中的類型的磨料顆粒。此等為存在於供使用以在CMP處理步驟期間自基板表面機械地移除材料之CMP漿液中之固體顆粒(例如奈米顆粒)。實例包括矽石顆粒、鈰氧顆粒、氧化鋯、氧化鋁粒子,以及其他以固體(非溶解)形式存在於漿液中之金屬及金屬氧化物磨料顆粒等。本說明書之清潔溶液(在用於清潔步驟之前,呈最初的形式)可含有以清潔溶液之總重量計不超過1、0.1、0.01、0.001、0.0001重量%的固體磨料顆粒。此等量代表使用時之清潔溶液,及濃縮物組合物。
類似地,如所描述之較佳清潔溶液不需要且可視情況不包括藉由與構成CMP基板之表面層的材料或與漿液的另一種材料進行化學相互作用來起作用的化學材料,以便於自基板表面有效地移除表面層材料。該等化學材料之實例包括界面活性劑、觸媒(例如金屬離子觸媒,尤其係鐵離子觸媒),及氧化劑等等。以清潔溶液之總重量計,示例清潔溶液可含有不超過1、0.1、0.01、0.001或0.0001重量%之界面活性劑、觸媒或氧化劑中之任一種或其組合。此等量代表使用時之清潔溶液,及濃縮物組合物。
出於自如所描述之清潔溶液中排除觸媒、氧化劑及界面活性劑作為成分之目的,「界面活性劑」為降低兩種液體之間或液體與固體之間表面張力(或界面張力)的有機化合物,通常為含有疏水性基團(例如烴(例如烷基)「尾部」)及親水性基團之有機兩親媒性化合物。界面活性劑可具有任何HLB (親水性親脂性平衡(hydrophilic - lipophilic balance))值,且可帶電、不帶電等,許多各種各樣的界面活性劑之實例在化學及CMP技術中為吾人所熟知。
「觸媒」為尤其係在存在氧化劑之情況下,可有效地向溶液(例如CMP漿液之液體載劑)提供金屬離子之材料,其能夠在CMP基板之表面層處存在金屬材料,尤其係在使用該漿液之CMP處理步驟期間自基板表面移除之金屬材料之情況下可逆氧化及還原,並且其中觸媒之金屬離子有助於移除。金屬離子型觸媒之實例在CMP技術中為吾人所熟知,且可以向漿液提供金屬離子,諸如鐵、鈷、銅、銪、錳、鎢、鉬、錸或銥之離子。該等鐵離子觸媒之實例可溶於液體載劑且可包括鐵(鐵III)或亞鐵(鐵II)化合物,諸如硝酸鐵、硫酸鐵、鹵化鐵(包括氟化鐵、氯化鐵、溴化鐵及碘化鐵,以及過氯酸鐵、過溴酸鐵及過碘酸鐵),及有機鐵化合物,諸如乙酸鐵、乙醯基丙酮酸鐵、檸檬酸鐵、葡糖酸鐵、丙二酸鐵、草酸鐵、鄰苯二甲酸鐵及丁二酸鐵及其混合物。
氧化劑(亦稱為氧化劑(oxidizing agent))為亦即或包括無機或有機過化合物之化合物。過化合物可以被理解為含有至少一個過氧基(-O-O-)之化合物,或含有最高氧化態元素之化合物。含有至少一個過氧基之化合物之實例包括過氧化氫及其加合物,諸如過氧化脲及過碳酸鹽;有機過氧化物,諸如過氧化苯甲醯、過氧乙酸及二第三丁基過氧化物;單過氧硫酸鹽(SO
5 =);二過氧硫酸鹽(S
2O
8 =)及過氧化鈉。含有最高氧化態元素之化合物之實例包括過碘酸、過碘酸鹽、過溴酸、過溴酸鹽、過氯酸、過氯酸鹽、過硼酸及過硼酸鹽及高錳酸鹽。用於CMP漿液之通常較佳氧化劑為過氧化氫。
在使用時,可稀釋如所描述之且呈濃縮形式之清潔組合物,以形成供後CMP清潔步驟使用之清潔溶液。濃縮物可包括如所描述之化學成分,其量在稀釋後將提供具有所需之各成分濃度之使用點組合物。濃縮物之pH可低於使用組合物之pH,例如,濃縮物之pH可低於2.5或低於2。加入濃縮物中以形成使用組合物之水的量,亦即稀釋率,可以視需要而定。示例濃縮物可以藉由10、50、100或200之係數來稀釋,例如,藉由將一定體積之濃縮物與為該濃縮物之體積10、50、100或200倍的體積之水合並。
根據用於使用如所描述之清潔溶液的方法之各種實例,微電子器件基板可以例如使用後CMP清潔裝置,在後CMP清潔步驟中進行清潔,以自基板表面移除殘餘物,包括磨料顆粒殘餘物。該基板可為微電子器件基板,一般而言為可以包括基底之平板晶圓,其具有已選擇性地沈積於該基板上且選擇性地自該基板移除以產生包括表面層之微電子特徵層之材料。表面層可由該等沈積材料製成,該等沈積材料包括一或多種金屬(例如銅、鎢、銀、鈷、鎳等)、絕緣或介電材料(例如TEOS、氮化矽)及半導體材料。在構成基板表面層之沈積材料的表面而非部分處,可能存在如所描述之殘餘物,包括在CMP步驟中所使用之磨料顆粒。
具有殘餘物之基板之具體實例為後CMP微電子器件基板,其在表面處含有金屬特徵(例如呈襯墊或互連(例如插塞)結構形式之鎢、銅或鈷),及一或多種非金屬材料,諸如介電材料或隔絕層(例如TEOS、氮化矽等等)。基板在表面處含有殘餘物,諸如磨料顆粒。磨料顆粒可為任何適用的類型,例如氧化鋁、矽石、鈰氧、氧化鋯或相關氧化物。磨料顆粒通常將為可用於處理特定類型之晶圓及在該晶圓表面處之材料的類型。例如,包括鎢特徵及在表面處之介電材料的基板可以藉由包括矽石磨料顆粒之CMP步驟預先進行處理。
根據清潔步驟,使在表面處具有殘餘物之CMP基板與聚合物清潔刷接觸,並將如所描述之清潔溶液分配於清潔刷及基板表面上。在所需之壓力量下,提供刷子與基板表面之間的相對運動。後CMP清潔步驟可有效減少在CMP步驟後存在於基板表面處之殘餘物,包括磨料顆粒之量。
實例
表1中列出說明本文中所描述之本發明之概念的實例,以及比較實例:
表1
調配物組分,% | 檸檬酸 | 單乙醇胺 | 聚(丙烯酸) | 山梨糖醇 | 丙三醇 | 木糖醇 | ***糖醇 | 果糖 | 甘露醇 | 聚葡萄糖 | 其他添加劑 | # PETEOS上之顆粒缺陷(標準化) |
對照,pH 6 | 3 | 4 | 0.05 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | |
比較樣品1,pH = 2 | 3 | 4 | 0.05 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2.8 | |
樣品1,pH = 2 | 3 | 4 | 0.05 | 6 | 0.54 | |||||||
樣品2,pH = 2 | 3 | 4 | 0.05 | 3 | 0.65 | |||||||
樣品3,pH = 2 | 3 | 4 | 0.05 | 6 | 3 | 0.22 | ||||||
樣品4,pH = 2 | 3 | 4 | 0.05 | 6 | 0.35 | |||||||
樣品5,pH = 2 | 3 | 4 | 0.05 | 6 | 0.49 | |||||||
樣品6,pH = 2 | 3 | 4 | 0.05 | 6 | 0.31 | |||||||
樣品7,pH = 2 | 3 | 4 | 0.05 | 6 | 0.28 | |||||||
樣品8,pH = 2 | 3 | 4 | 0.05 | 6 | 0.25 | |||||||
比較實例清潔劑1,pH = 2 | 3 | 4 | 0.05 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 2.6 |
比較實例清潔劑2,pH = 2 | 3 | 0 | 0.05 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 5.8 |
比較實例清潔劑3,pH = 2 | 3 | 4 | 0.05 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 3.2 |
PETEOS晶圓用基於膠質矽石之CMP漿液在IC 1010墊上進行拋光,並用5種具有不同pH之調配物進行清潔:對照物,pH 6;清潔劑1、2及3 (pH = 2)及商品dAmmonia,pH 10。拋光在AMAT Reflexion LK拋光工具上進行,並且缺陷檢查在≥0.1/0.065/0.060 µm缺陷大小之KLAT SP-3工具及KLAT eDR-7100缺陷審查工具(顯微鏡、SEM、EDX)上進行。
在沒有超音波震盪清洗(megasonic)步驟之情況下,清潔用Entegris刷(PVP1ARXR1)進行。
圖1示出在以pH < 6及pH > 6清潔之PETEOS晶圓上之缺陷度資料,其中僅當使用清潔劑1、2及3時,在pH ~ 2下偵測到刷痕。
圖2示出在低pH下基於矽石刷氫鍵合之刷印形成之機制。
加載有矽石之刷子亦可使用FTIR光譜法來偵測,在此處可以清楚地區分約1100 cm
- 1之矽石Si-O-Si峰與約1016 cm
- 1之刷子特徵峰C-O-C (圖3)。
表2中呈現具有在此實驗中所使用之H鍵合矽石刷清潔添加劑的列表:
表2
調配物 | 添加劑 |
1 | 丙三醇 + K2S2O5 |
4 | 丙三醇 + 甲酸 |
8 | 丙三醇 + 3 MPA |
13 | 丙三醇 + 脲 |
15 | 丙三醇 + DMSO |
16 | 丙三醇 + 草酸 |
18 | 順丁烯二酸 |
19 | 乙醇酸 |
20 | 山梨糖醇 |
21 | 環丁碸 |
圖4中呈現用含有此等添加劑之pH 2調配物中之一些進行清潔的受矽石污染的刷子的FTIR譜圖:
圖5及6示出呈樣品1-8 (表1) (本發明,使用豐富的矽石-H-鍵合添加劑或刷子-H-鍵合添加劑)與不具有此等添加劑之比較實例的直接比較形式的PETEOS晶圓上之缺陷度。
無
圖1示出用特定發現之方法及材料清潔的晶圓的效能資料。
圖2示出所提出之刷印形成機制。
圖3示出在如所描述之表面處具有矽石之刷子的FTIR譜圖資料。
圖4示出在不同清潔材料之情況下,在表面處具有矽石之刷子的FTIR譜圖資料。
圖5及6示出自使用如所描述之各種清潔溶液所導出之資料。
Claims (4)
- 一種基板之化學機械後處理(後CMP(post-chemical-mechanical- processing))清潔之方法,該方法包含: 提供具有聚合物表面之後CMP清潔刷, 提供pH低於7之清潔溶液,該清潔溶液包含: 包含檸檬酸及一或多種有機溶劑之清潔劑,及 顆粒移除劑,其係:乳酸、順丁烯二酸、脲、乙醇酸、山梨糖醇、硼砂、脯胺酸、甜菜鹼、甘胺酸、組胺酸、三(三(羥甲基)胺基甲烷)、二甲亞碸、環丁碸、丙三醇、木糖醇、果糖、甘露醇、阿糖醇、硫酸葡聚糖或其組合,及 提供包括一表面之基板,其在該基板表面處具有殘餘物,該殘餘物包括磨料顆粒,及 藉由使該基板表面及該聚合物表面曝露於該清潔溶液中,同時使該基板表面與該聚合物表面接觸並且同時使該基板表面相對於該聚合物表面移動,自該基板表面移除殘餘物。
- 一種可用於在化學機械後處理步驟中清潔基板之pH低於2.5之清潔溶液濃縮物,該清潔溶液濃縮物包含: 包含一或多種有機溶劑之清潔劑,及 至少0.1重量%顆粒移除劑,其係:乳酸、順丁烯二酸、脲、乙醇酸、山梨糖醇、硼砂、脯胺酸、甜菜鹼、甘胺酸、組胺酸、三(三(羥甲基)胺基甲烷)、二甲亞碸、環丁碸、丙三醇、木糖醇、甘露醇、阿糖醇、硫酸葡聚糖或其組合。
- 如請求項2之方法,其包含: 0.1至20重量%之清潔劑,及 0.1至20重量%之該顆粒移除劑。
- 如請求項2之方法,其中該清潔劑包含一或多種螯合劑。
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